Alignment Bushes

Alignment bushes provide additional suspension geometry correction by repositioning a mounting point within the bush rather than replacing the complete suspension arm. Offset and double offset bush designs can provide additional camber, caster or toe correction where the standard alignment range is insufficient.

Depending on the suspension design, alignment bushes can be used at the front or rear and can help correct geometry after changes in ride height or where additional adjustment is required. Some designs also combine caster correction with anti-lift geometry. The amount and direction of correction vary by application, so accurate alignment measurements should be used to determine what the suspension actually needs.

What Are Alignment Bushes?

Alignment bushes are suspension bushes designed to change the position of a suspension mounting point to alter wheel geometry. Instead of keeping the inner sleeve centred within the bush, an offset design positions it differently so the connected suspension arm sits in a revised position.

That relatively small change at the mounting point can alter camber, caster or toe, depending on where the bush is fitted and how the suspension is designed.

This makes alignment bushes a useful correction method where additional geometry change is required without replacing the complete suspension arm with an adjustable component.

Offset and Double Offset Bushes

An offset bush uses an eccentric or repositioned centre to move the suspension mounting point from its original position.

A double offset arrangement can provide a different amount or direction of correction depending on its design and orientation.

The resulting alignment change is application-specific. Do not assume every offset or double offset bush provides the same adjustment range.

Correct orientation during installation is critical because rotating or positioning an offset bush incorrectly can change the direction of the intended correction.

How Do Alignment Bushes Change Camber, Caster and Toe?

Alignment bushes change wheel geometry by moving the effective mounting position of a suspension arm or related component. Which alignment angle changes depends on the bush location, suspension design and direction of the offset.

A small change at a suspension pivot can alter the position of the wheel or steering axis farther out in the suspension assembly.

For this reason, alignment bushes should be chosen according to the specific geometry requiring correction rather than simply because an alignment measurement is outside specification.

Camber Correction

Camber describes the inward or outward tilt of the wheel when viewed from the front or rear.

An offset bush can move the relevant suspension mounting point so that the arm changes the wheel's camber position. Depending on the application and bush orientation, the correction may move camber in a positive or negative direction.

This can be useful where ride-height changes or suspension geometry leave the standard camber adjustment unable to achieve the required setting.

The available correction varies by application and should always be verified using alignment equipment.

Caster and Anti-Lift

Caster is the forward or rearward inclination of the steering axis when viewed from the side.

On applicable front suspension designs, offset bushes can reposition an arm to add positive caster. Specific applications can provide corrections in the region of +0.5? to +1.0?, but these figures should not be treated as universal adjustment ranges.

Some bush configurations also incorporate anti-lift geometry.

Anti-lift changes the relationship between suspension mounting points to influence how the front suspension reacts to longitudinal forces during acceleration and braking. It should not be interpreted as preventing suspension movement entirely.

Changing mounting geometry and reducing compliance can also affect noise, vibration and harshness. Some performance-oriented configurations may transmit more road feel into the vehicle, so the trade-off between isolation and suspension control should be considered.

Toe and Bump Steer Correction

Toe describes whether the wheels point inward or outward relative to the vehicle centreline when viewed from above.

Where an offset bush changes the position of a suspension link that influences toe, it can provide additional toe correction.

Some suspension correction components can also be used to address bump steer, where toe changes as the wheel moves through suspension travel. Bump steer correction is highly dependent on suspension and steering geometry, so it should not be treated as a universal function of alignment bushes.

The required correction should be identified through proper suspension measurement rather than symptoms alone.

Types of Alignment Bushes

Alignment bushes can be used at different suspension mounting points depending on which geometry needs correction. Their function is determined by the suspension design, bush position and offset rather than by a single universal alignment-bush layout.

Front Suspension Alignment Bushes

At the front suspension, offset bushes can be used at applicable control arm, strut rod or similar locating-arm mounting points.

Depending on their position, these bushes can provide additional caster, camber or combined geometry correction. Some applications can also incorporate anti-lift geometry.

The amount of correction is specific to the bush and vehicle. A professional alignment should establish what correction is needed before components are selected.

Rear Camber and Toe Bushes

Independent rear suspension systems can use offset bushes to provide additional camber or toe correction where the standard adjustment is limited.

These can be particularly relevant after changes in ride height alter the suspension's resting geometry.

Some applications provide correction in one alignment angle, while others can influence multiple measurements because suspension links interact. Rear camber and toe should therefore be checked together during the final alignment.

Leading Arm Offset Bushes

Offset bushes can also provide geometry correction at the leading or locating arms used in certain 4WD suspension designs.

Changing the position of these mounting points can help correct suspension geometry where ride-height changes have altered the arm position.

The required offset depends on the vehicle and suspension configuration. Lift height alone should not be used to determine the appropriate correction without measuring the resulting geometry.

When Might a Vehicle Need Alignment Bushes?

Alignment bushes may be appropriate when the required camber, caster or toe setting cannot be achieved within the suspension's existing adjustment range. This can occur after changes to ride height, suspension modifications or where a particular geometry correction is required.

Situations worth investigating include:

• Alignment measurements outside the required specification
• Insufficient factory adjustment range
• Geometry changes following lowering
• Geometry changes following a suspension lift
• A need for additional caster or camber correction
• A specific alignment requirement for a modified suspension setup

Alignment bushes should not be used to disguise worn or damaged suspension components.

Bushes, ball joints, arms, joints and mounting points should be inspected before additional geometry correction is introduced.

What Are the Symptoms of Worn Suspension Bushes?

Worn suspension bushes can allow excessive movement at suspension mounting points, potentially contributing to noise, steering changes or inconsistent wheel alignment. These symptoms are not unique to bushes, so inspection is required before deciding what needs replacement.

Possible signs include:

• Clunking over bumps
• Vague or inconsistent steering
• Movement or noise during braking
• A vehicle pulling to one side
• Uneven tyre wear
• Alignment settings that do not remain consistent
• Visible cracking, distortion or excessive movement at a bush

A car that clunks over bumps does not automatically have worn alignment bushes.

Ball joints, tie rod ends, shock absorbers, wheel bearings, other suspension bushes and loose or damaged components can create similar symptoms.

Have the suspension inspected by a qualified technician where the cause is unclear.

Should I Choose Alignment Bushes or Adjustable Arms?

Alignment bushes and adjustable suspension arms can both provide additional geometry correction, but they achieve it differently. The appropriate option depends on the suspension design, required adjustment range and intended setup.

An offset alignment bush generally provides a defined geometry change through its mounting position.

An adjustable arm changes its effective length or mounting relationship and may provide a broader adjustment range, depending on its design.

Neither solution is universally better.

Start with alignment measurements, identify which angle requires correction and then use the method designed for that suspension application.

How Are Alignment Bushes Fitted?

Fitting alignment bushes generally requires removing or disconnecting the relevant suspension arm, pressing out the existing bush and installing the replacement in the correct orientation. Accurate positioning is particularly important with offset designs because orientation determines the resulting geometry change.

What the Job Involves

Installation may involve:

• Safely raising and supporting the vehicle
• Supporting the relevant suspension components
• Removing or disconnecting the applicable suspension arm
• Pressing out the existing bush
• Inspecting the arm and bush housing
• Positioning the offset bush in the specified orientation
• Pressing the replacement bush into place
• Reinstalling the arm and associated hardware
• Tightening fasteners according to the specified procedure

Suitable press tools are often required. Incorrect removal or installation can damage the arm, bush or surrounding components.

Where required by the bush design, final tightening should be completed with the suspension at normal ride height to avoid unintended preload.

Wheel Alignment After Fitting

A professional wheel alignment is required after fitting alignment bushes.

The purpose of the bush is to change suspension geometry, so the resulting camber, caster and toe must be measured rather than assumed from the nominal correction.

Other applicable alignment angles should also be checked because changing one suspension mounting point can influence more than one measurement.

Choosing Alignment Bushes for Your Vehicle

Choose alignment bushes according to the suspension design, mounting position and geometry that requires correction.

Start with accurate alignment measurements and confirm the amount and direction of correction required. Fitment assistance is available if you're unsure which offset bush configuration is appropriate for your suspension setup.

Shop Alignment Bushes with Whiteline

Our alignment bushes provide application-specific camber, caster and toe correction where additional suspension geometry adjustment is required.

Choose the correct fitment with the added confidence of our warranty and 60 Day Returns, with fitment assistance available when you need help identifying the appropriate alignment solution.